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This CL adds UI flag to add WebAuthN UI that guides users through the
pairing process when using Bluetooth authenticators.

Bug: 877344
Change-Id: I12a109fc34f947e64db0ad99089f83fb39ccf6d0
Reviewed-on: https://chromium-review.googlesource.com/c/1329926
Commit-Queue: Jun Choi <hongjunchoi@chromium.org>
Reviewed-by: Kim Paulhamus <kpaulhamus@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607015}